By Harris Andrea
Cisco ASA Firewall basics – third version: step by step sensible Configuration advisor utilizing the CLI for ASA v8.x and v9.x This e-book has been to be had simply in e-book structure for a number of years and has been embraced by means of millions of Cisco ASA execs, from rookies to specialists. This new version, “Cisco ASA Firewall basics – third version” is now provided to you in paperback structure in addition. the hot third variation has been improved and up to date to hide the most recent Cisco ASA model 9.x (and earlier models 8.x as well). All configurations, instructions and examples within the e-book are acceptable for all ASA 5500 and 5500-X units and may paintings on ASA model 9.x. This publication is loaded with uncooked useful techniques, step by step configuration tutorials, and greater than 50 community diagrams to give an explanation for the eventualities. it is also whole configuration examples and real-world circumstances that you're going to no longer locate at any place else. there is not any fluff or redundant info. subject matters lined during this e-book comprise the center ASA firewall gains in addition to the main frequently-encountered situations that you'll locate in actual international networks. The ebook is written by way of community safeguard specialist Harris Andrea, a Cisco qualified expert with greater than 18 years of ASA event, and specializes in simplicity and practicality rather than complicated idea. a number of the subject matters lined contain the next: Getting began with Cisco ASA Firewalls (User Interface, entry Modes, software program updates, password restoration etc). easy Firewall Configuration (Basic Configuration Steps). Configuring community deal with Translation (NAT) for pre-8.3 and post-8.3 models. Configuring DMZ Networks. Configuring and utilizing entry keep watch over Lists (ACLs). Configuring VLANs and Subinterfaces. Configuration of chance Detection (Basic, complex, and Scanning probability Detection). IKEv1 and IKEv2 IPSEc VPNs (site-to-site VPN, distant entry VPN etc). Anyconnect safe Mobility patron (SSL VPN, IKEv2 VPN, certificates Authentication etc). Configuring Active/Standby Stateful Failover. complex positive aspects of gadget Configuration. Authentication Authorization and Accounting (AAA) Configuration. Configuration of identification Firewall. Configuring Routing Protocols on ASA (Static Routes, RIP, OSPFv2, OSPFv3, EIGRP). Modular coverage Framework Configuration (Class Maps, coverage Maps etc). Configuring caliber of carrier (QoS)-Traffic Policing, Shaping, Voice precedence Queueing and so forth. Cisco ASA 5505. PLUS even more
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Extra info for Cisco ASA Firewall Fundamentals, 3rd Edition
Sample text
Both LAN1 and LAN2 will also have local Internet access. Therefore we need to configure Dynamic NAT on the ASA firewalls to allow the private LAN networks to access the Internet. However, traffic from LAN-1 to LAN-2 (and viceversa) which will pass through the VPN tunnel, MUST be excluded from any NAT operation. 0 ASA-2(config-network-object)# exit ASA-2(config)# nat (inside,outside) 1 source static obj-local obj-local destination static objremote obj-remote 46 Enjoy Chapter 3 Using Access Control Lists (ACL) In Chapter 2 we have described the Network Address Translation (NAT) security mechanism, which is one of the two major elements that an administrator needs to configure in order to enable communication through the firewall.
Per-Session PAT improves greatly the scalability of PAT because at the end of 35 Enjoy each per-session PAT connection, the ASA sends a reset and immediately removes the translation, thus tearing down the connection and hence freeing up resources on the device. For "hit-and-run" traffic, such as HTTP or HTTPS, the per-session feature is very efficient. However, for real time traffic (such as VoIP, H323, SIP etc) Per-Session PAT is not good. As we’ve said above, per-session PAT is enabled by default.
2 but with a different source port (1025). The source ports are dynamically changed to a unique number greater than 1023. A single PAT address can support around 64,000 inside hosts. Monitoring PAT Translations The ciscoasa# show xlate command displays the contents of the PAT translation table. 2 with source port 1024. The firewall keeps track of all NAT sessions using its xlate table, so that when a reply packet comes back from outside, the firewall will check its translation table to see which port number belongs to the particular reply packet in order to deliver it to the correct internal host.
